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Yes you need to go to the ER since it is important to treat high blood sugar, because if left untreated, hyperglycemia can become severe and lead to serious complications. Prompt medical care is essential and recommended.
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The dehydration as well as the electrolyte imbalances need to be corrected. Also your doctor needs to consider what may have triggered the severe hyperglycemia. And you may need to take additional medications for the optimal management of your diabetes in the future.
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